1. From the Division of Nephrology (M.Q., R.A.), University of Texas Health Science Center at San Antonio and South Texas Veterans Health Care System, San Antonio, Tex; Department of Laboratory Medicine (M.K.), Kenezy Gyula Hospital, Debrecen, Hungary; Graduate Center for Nutritional Sciences (J.M.C.) and the Department of Pediatrics (E.J.S.), University of Kentucky, Lexington, Ky; University of Texas Southwestern Medical Center (W.Z.), Dallas, Tex; Division of Cardiology (M.S.S.), University of Texas...